For laser-welded diamond saw blades, parameters such as appearance, microstructure and welding strength need to be tested. Appearance inspection mainly detects whether there are welding macroscopic defects such as holes, cracks, undercuts and incomplete penetration, etc., usually 100% inspection is required. Observed structure inspection mainly detects changes in the chemical composition, apparent structure and phase structure of the welded part. Studies have shown that the fine chemical composition of the melting zone has a gradient diffusion, and the hardness of the transition layer is lower than that of the matrix and higher than the cutter head, showing a gradient change. Welding strength testing mainly detects the tensile strength, bending strength, impact toughness and residual stress of weldments, usually 100% welding strength testing is required, and different special testing tools have been developed at home and abroad, such as German SPE623 welding strength The inspection machine and China's torque wrench are currently basically not involved in the residual stress detection of the weldment, and the size and distribution of the residual stress after welding seriously affect the service life of the diamond saw blade.
At present, there are still some problems in the process of laser welding diamond saw blades. We need to conduct further research, develop special laser welding diamond saw blade matrix or transition layer material formula research, develop new ultra-fine or nano pre-alloyed powders, Carry out research on the mechanism of laser welding diamond saw blades, especially research on temperature field, flow field, mass field and stress field in the process of laser welding diamond saw blades, and research on online quality monitoring technology of laser welding diamond saw blades. In fact, only by fully understanding the mechanism of laser welding diamond saw blades can it be possible to develop new online quality monitoring technologies; only by mastering the theory of pre-alloyed powders, can it be possible to develop new ultra-fine or nano-pre-alloyed powders and Make better use of new ultra-fine or nano-pre-alloyed powder to develop special diamond saw blades.
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